How to copy Excel sheets with exact cell value and formats

Please help me to copy the excel sheets with exact cell values. We are using poi 3.7.jar.we are facing issues while copying contents from one excel sheet to another excel (.xls). we are getting correct cell values up to 10 sheets,if it crosses more than 10 sheetsthen its not showing the exact cell value as like in input excel(.xls).(please find the example cell values like : -2.872334459 instead of (2.6) , -0.184436764 instead of (18.4%)
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